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ffmpeg / tests / ref / acodec @ 91819763

Name Size Revision Age Author Comment
ac3_fixed 94 Bytes e05a3ac7 over 9 years Justin Ruggles ac3enc: select bandwidth based on bit rate, sam...
adpcm_ima_qt 252 Bytes c43d77c1 about 10 years Måns Rullgård tiny_psnr: skip wav headers on input files The...
adpcm_ima_wav 253 Bytes c43d77c1 about 10 years Måns Rullgård tiny_psnr: skip wav headers on input files The...
adpcm_ms 246 Bytes c43d77c1 about 10 years Måns Rullgård tiny_psnr: skip wav headers on input files The...
adpcm_swf 249 Bytes c43d77c1 about 10 years Måns Rullgård tiny_psnr: skip wav headers on input files The...
adpcm_yam 249 Bytes c43d77c1 about 10 years Måns Rullgård tiny_psnr: skip wav headers on input files The...
alac 234 Bytes c43d77c1 about 10 years Måns Rullgård tiny_psnr: skip wav headers on input files The...
flac 236 Bytes c43d77c1 about 10 years Måns Rullgård tiny_psnr: skip wav headers on input files The...
g726 233 Bytes c7d89948 almost 10 years Justin Ruggles Set a constant frame size for encoding G.726 au...
mp2 298 Bytes c43d77c1 about 10 years Måns Rullgård tiny_psnr: skip wav headers on input files The...
pcm 4.27 KB 91819763 over 9 years Anton Khirnov matroskaenc: don't write an empty Cues element.
wmav1 237 Bytes c43d77c1 about 10 years Måns Rullgård tiny_psnr: skip wav headers on input files The...
wmav2 237 Bytes c43d77c1 about 10 years Måns Rullgård tiny_psnr: skip wav headers on input files The...

Latest revisions

# Date Author Comment
91819763 04/07/2011 04:11 PM Anton Khirnov

matroskaenc: don't write an empty Cues element.

e05a3ac7 04/04/2011 12:59 AM Justin Ruggles

ac3enc: select bandwidth based on bit rate, sample rate, and number of
full-bandwidth channels.

This reduces high-frequency artifacts and improves the quality of the lower
frequency audio at low bit rates.

79997def 04/03/2011 06:01 PM Mans Rullgard

ac3enc: use generic fixed-point mdct

This makes the AC3 encoder use the shared fixed-point MDCT rather
than its own implementation. The checksum changes are due to
different rounding in the MDCT.

Signed-off-by: Mans Rullgard <>

e6e98234 03/23/2011 01:08 AM Justin Ruggles

Add apply_window_int16() to DSPContext with x86-optimized versions and use it
in the ac3_fixed encoder.

323e6fea 03/14/2011 12:45 PM Justin

ac3enc: do not right-shift fixed-point coefficients in the final MDCT stage.

This increases the accuracy of coefficients, leading to improved quality.
Rescaling of the coefficients to full 25-bit accuracy is done rather than
offsetting the exponent values. This requires coefficient scaling to be done...

5b54d4b3 02/16/2011 11:39 PM Justin Ruggles

ac3enc: fix bug in stereo rematrixing decision.

The rematrixing strategy reuse flags are not reset between frames, so they
need to be initialized for all blocks, not just block 0.

Signed-off-by: Mans Rullgard <>

50d71404 02/15/2011 09:40 PM Justin Ruggles

ac3enc: change default floor code to 7.

This is to match the value in every (E-)AC-3 file from commercial sources.
It has a negligible effect on audio quality.

Signed-off-by: Mans Rullgard <>

c3beafa0 02/02/2011 08:00 PM Justin Ruggles

ac3enc: Change EXP_DIFF_THRESHOLD to 500.

This patch changes the exponent difference threshold in the exponent
strategy decision function of the AC-3 encoder. I tested lowering in
increments of 100. From 1000 down to 500 generally increased in quality
with each step, but 400 was generally much worse....

dc7e07ac 01/08/2011 11:21 PM Justin Ruggles

Add stereo rematrixing support to the AC-3 encoders.
This improves the audio quality significantly for stereo source with both the
fixed-point and floating-point AC-3 encoders.
Update acodec-ac3_fixed and seek-ac3_rm test references.

Originally committed as revision 26271 to svn://svn.ffmpeg.org/ffmpeg/trunk

6fd96d1a 01/04/2011 11:53 AM Justin Ruggles

Change the AC-3 encoder to use floating-point.
Fixed-point AC-3 encoder renamed to ac3_fixed.
Regression test acodec-ac3 renamed to acodec-ac3_fixed.
Regression test lavf-rm changed to use ac3_fixed encoder.

Originally committed as revision 26209 to svn://svn.ffmpeg.org/ffmpeg/trunk

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